White triangular plume against a blue sky ascending.

While driving for a ride share company, two passengers and I witnessed what may have been a rock launch.  I was in San Jose on Capitol Expressway at the intersection of Marten/Ocala facing South.  My two passengers and I saw a white plume shaped as a triangular trajectory as if an upward bound craft was making its ascent.  I turned East onto Marten Avenue and could no longer see the unidentified object.